package com.atguigu.servlet;


import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

public class UploadServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        System.out.println("文件上传过来了");
        //文件以流的形式发送，因此只能以流的形式接收
//        System.out.println(req.getParameter("username"));
//        System.out.println(req.getParameter("photo"));

//        ServletInputStream inputStream = req.getInputStream();

//        byte[]buffer=new byte[1024000];
//        int length = inputStream.read(buffer);
//        System.out.println(new String(buffer,0,length));
//        byte[] buffer=new byte[1024];
//        int len ;
//        while((len=inputStream.read(buffer))!=-1){
//            String  str=new String(buffer,0,len);
//            System.out.println(str);
//        }


        //1.判断上传的数据是否为多段数据(只有是多段的数据，才是文件上传的)
        if(ServletFileUpload.isMultipartContent(req)){//返回true表示多段
            req.setCharacterEncoding("UTF-8");
            //创建FileItemFactory工厂实现类
            FileItemFactory fileItemFactory=new DiskFileItemFactory();
            //创建用于解析上传数据的工具类ServletFileUpload类
            ServletFileUpload servletFileUpload=new ServletFileUpload(fileItemFactory);
            //解析上传的数据，得到每一个表单项FileItem
            try {
                List<FileItem> list=servletFileUpload.parseRequest(req);
                //循环判断，每一个表单项，是普通类型，还是上传的文件
                for (FileItem fileItem:list){

                    if(fileItem.isFormField()){
                        //普通表单项
                        System.out.println("表单项的name属性值"+fileItem.getFieldName());
                        //参数UTF-8解决乱码问题
                        System.out.println("表单项的Value属性值"+fileItem.getString("UTF-8"));
                    }else{
                        //上传的文件
                        System.out.println("表单项的name属性值:"+fileItem.getFieldName());
                        System.out.println("上传的文件名："+fileItem.getName());

                        fileItem.write(new File("D:\\"+fileItem.getName()));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
